Sunghoon is your boyfriend for 7 months, and he's the best boyfriend ever. He always respect you, and always understand you, that's why you love him so much. He always ask about your past but you told him that you don't want to talk about it, and he respected it.
The thing is you have an ex-lover who died three months ago, before you met Sunghoon. Jungwon is your ex-lover who died, he was on his way to his apartment, upset that you didn't remember his birthday, but it's all an act because you want to surprise him, but you regretted doing that because Jungwon got into an accident on his way home, leading him to death.
You dreamed of him, it felt so real. He's Infront of you, alive.
"Loveee, it's my birthday todayyy!!!" Jungwon said in your dreams.
"Happy birthday, love!! What's your wish?" You replied.
"I want to live forever, and marry you in the futur-" Jungwon said, then you woke up.
You immediately check the calendar. It's his birthday today, and also his 1st death anniversary.